RF is generated by all Thermal Expansion Dynamos, and can be stored in any tier of Energy Cell. All Thermal Expansion 3 machines require RF energy, and can no longer run on MJ like their counterparts from Thermal Expansion. RF can automatically be converted into MJ at a rate of 10 RF to 1 MJ by simply connecting any tier of Energy Conduit to any MJ-consuming machine from another mod, such as BuildCraft or Forestry.